1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/tcp_lp.c b/net/ipv4/tcp_lp.c
index 43294ad9f63e..e49836ce012e 100644
--- a/net/ipv4/tcp_lp.c
+++ b/net/ipv4/tcp_lp.c
@@ -266,7 +266,8 @@ static void tcp_lp_pkts_acked(struct sock *sk, u32 num_acked, ktime_t last)
         struct tcp_sock *tp = tcp_sk(sk);
         struct lp *lp = inet_csk_ca(sk);
 
-        tcp_lp_rtt_sample(sk,  ktime_to_us(net_timedelta(last)));
+        if (!ktime_equal(last, net_invalid_timestamp()))
+                tcp_lp_rtt_sample(sk,  ktime_to_us(net_timedelta(last)));
 
         /* calc inference */
         if (tcp_time_stamp > tp->rx_opt.rcv_tsecr)